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Applied Instruments 1685 CATV Multi-Carrier RF Test Signal Generator

Applied Instruments 1685
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RackMount RF CW Test Signal Generator (5 to 1000 MHz, 1 to 8 carriers)


  • Up to eight individually or simultaneously activated RF carriers
  • Spectral purity in excess of 60 dB allows for accurate hum and noise evaluation without interference Configurable with a combined single output connector, or a separate dedicated output connector for each test signal
  • CATV Applications
  • System alignment
  • Carrier-to-noise measurement
  • Carrier-to-hum modulation 
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Product Information

Applied Instruments 1685 CATV Multi-Carrier RF Test Signal Generator


Headend/Hubsite RF Multi-Carrier CW Test Signal Generator



Spectrum Analyzers are useful for system frequency-response testing. The cable system's video carriers act as stimuli and the spectrum analyzer measures the response at any point in the cascade of amplifiers. The beauty of this technique is that there is no subscriber interference. The shortcoming is that if your system is not carrying channels throughout the passband, the spectrum analyzer has nothing to measure. Using a 1685's CW continuous wave test signals provides stable, clean stimuli for frequency response testing that won't interfere with existing channels. 

Applied Instruments Multi-Carrier RF Test Signal Generator


The Model 1685 is a headend/hubsite RF multi-carrier generator. It is custom-built and can be built in configurations from 1 carrier up to 8 carriers with any carrier frequencies from 5 MHz up to 1218 MHz.

Each CW carrier can be activated individually or simultaneously. The RF carriers generated are extremely clean and stable, thus making the 1685 an ideal instrument for testing/aligning the CATV forward band.

The Model 1685 generates RF continuous wave signals for use as reference signals when aligning a CATV forward band. This rack-mount unit may be configured with one to eight RF carriers. Each carrier may be activated individually or simultaneously. The optional built-in attenuator provides up to 70 dB of carrier amplitude range. With spectral purity of at least 60 dBc, the carriers may also be used for hum and noise evaluation tests. 



Applied Instruments 1685 CATV Multi-Carrier RF Test Signal Generator Specifications

Max output level (dBmV)  Frequency (MHz)    
5-860 861-1000  1001-1218
1 to 2 carriers +59 +57 +55
3 to 4 carriers +55 +53 +51
5 to 6 carriers +52 +50 +48
7 to 8 carriers +50 +48 +46
Optional Built-in Attenuator 0 to 70 dB in 10 & 20 dB steps
Individual amplitude adjustment 0 to -13 dB
Amplitude stability +0.5 dB/setting
Spectral purity (spurious & harmonic) >60 dBc
Residual hum <0.01%
Frequency accuracy >0.01% kHz (10 MHz to 1218 MHz>br>1.0 kHz (5 MHz to 10 MHz)
Output impedance 75
Size (W x H x D) 1.75" x 19" (std. rack) x 12.5"
(4.5cm) x (48.3cm) x (31.8cm)
Power 100-240 VAC, 50-60 Hz
Certifications CE
Weight 8.5 Pounds

Applied Instruments 1685 Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Generators / Counters/RF Signal Generator Template

Minimum Frequency Range (kHz)5 Mhz
Maximum Frequency Range1218 Mhz
Modulation Types (generator)Other 
Output dB Range Min0 dB
Output dB Range Max70 dB
Variable/Step AttenuatorYes
Made for catv/TV market Yes

Test Equipment General Attributes

Unique Features• Up to eight individually or simultaneously activated RF carriers
• 5-1218 MHz Frequency Range
Warranty12 MONTHS (1 YEARS)
Warranty DetailsThe Applied Instruments Model 1685 is warranted against defects in materials and workmanship for a period of twelve months. Applied Instruments agrees to repair or replace any assembly or component found to be defective under normal use during this period. Our obligation under this warranty is limited solely to repairing the instrument proven to be defective within the scope of the warranty when returned to the factory. Transportation to the factory is to be prepaid by the customer. Authorization (RMA#) by Applied Instruments is required prior to shipment.

Applied Instruments assumes no liability for secondary charges or consequential damages and, in any event, Applied Instruments’ liability for breach of warranty under any contract shall not exceed the purchase price of the instrument shipped, and against which a claim is made.
Safety ApprovalCE
Interfaces I/O RF
Product Weight8.5 LBS
Product Height1.75 IN
Product Width19 IN
Country of OriginUnited States
Other Information

Product Depth:: 12.5"


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